The opposite of Big Bang. Where the Big Bang is a scientific theory which describes the birth of the universe and its expansion thereafter, the Big Crunch predicts the same universe will at some point collapse in on itself due to gravity forces. The Big Crunch is one possible logical consequence of the Big Bang theory, but no proof so far has confirmed it to be true.

The Big Crunch will undo the effect of the Big Bang, but also make another Big Bang possible